pyspark.sql.Column.asc_nulls_first¶
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Column.asc_nulls_first() → pyspark.sql.column.Column¶ Returns a sort expression based on ascending order of the column, and null values return before non-null values.
Examples
>>> from pyspark.sql import Row >>> df = spark.createDataFrame([('Tom', 80), (None, 60), ('Alice', None)], ["name", "height"]) >>> df.select(df.name).orderBy(df.name.asc_nulls_first()).collect() [Row(name=None), Row(name='Alice'), Row(name='Tom')]